#![allow(rustc::diagnostic_outside_of_impl)]
#![allow(rustc::untranslatable_diagnostic)]
use std::borrow::Cow;
use rustc_ast::util::unicode::TEXT_FLOW_CONTROL_CHARS;
use rustc_errors::{
Applicability, Diag, DiagArgValue, LintDiagnostic, elided_lifetime_in_path_suggestion,
};
use rustc_middle::middle::stability;
use rustc_session::Session;
use rustc_session::lint::{BuiltinLintDiag, ElidedLifetimeResolution};
use rustc_span::BytePos;
use rustc_span::symbol::kw;
use tracing::debug;
use crate::lints::{self, ElidedNamedLifetime};
mod check_cfg;
pub(super) fn decorate_lint(sess: &Session, diagnostic: BuiltinLintDiag, diag: &mut Diag<'_, ()>) {
match diagnostic {
BuiltinLintDiag::UnicodeTextFlow(comment_span, content) => {
let spans: Vec<_> = content
.char_indices()
.filter_map(|(i, c)| {
TEXT_FLOW_CONTROL_CHARS.contains(&c).then(|| {
let lo = comment_span.lo() + BytePos(2 + i as u32);
(c, comment_span.with_lo(lo).with_hi(lo + BytePos(c.len_utf8() as u32)))
})
})
.collect();
let characters = spans
.iter()
.map(|&(c, span)| lints::UnicodeCharNoteSub { span, c_debug: format!("{c:?}") })
.collect();
let suggestions = (!spans.is_empty()).then_some(lints::UnicodeTextFlowSuggestion {
spans: spans.iter().map(|(_c, span)| *span).collect(),
});
lints::UnicodeTextFlow {
comment_span,
characters,
suggestions,
num_codepoints: spans.len(),
}
.decorate_lint(diag);
}
BuiltinLintDiag::AbsPathWithModule(mod_span) => {
let (replacement, applicability) = match sess.source_map().span_to_snippet(mod_span) {
Ok(ref s) => {
let opt_colon = if s.trim_start().starts_with("::") { "" } else { "::" };
(format!("crate{opt_colon}{s}"), Applicability::MachineApplicable)
}
Err(_) => ("crate::<path>".to_string(), Applicability::HasPlaceholders),
};
lints::AbsPathWithModule {
sugg: lints::AbsPathWithModuleSugg { span: mod_span, applicability, replacement },
}
.decorate_lint(diag);
}
BuiltinLintDiag::ProcMacroDeriveResolutionFallback { span: macro_span, ns, ident } => {
lints::ProcMacroDeriveResolutionFallback { span: macro_span, ns, ident }
.decorate_lint(diag)
}
BuiltinLintDiag::MacroExpandedMacroExportsAccessedByAbsolutePaths(span_def) => {
lints::MacroExpandedMacroExportsAccessedByAbsolutePaths { definition: span_def }
.decorate_lint(diag)
}
BuiltinLintDiag::ElidedLifetimesInPaths(n, path_span, incl_angl_brckt, insertion_span) => {
lints::ElidedLifetimesInPaths {
subdiag: elided_lifetime_in_path_suggestion(
sess.source_map(),
n,
path_span,
incl_angl_brckt,
insertion_span,
),
}
.decorate_lint(diag);
}
BuiltinLintDiag::UnknownCrateTypes { span, candidate } => {
let sugg = candidate.map(|candidate| lints::UnknownCrateTypesSub { span, candidate });
lints::UnknownCrateTypes { sugg }.decorate_lint(diag);
}
BuiltinLintDiag::UnusedImports {
remove_whole_use,
num_to_remove,
remove_spans,
test_module_span,
span_snippets,
} => {
let sugg = if remove_whole_use {
lints::UnusedImportsSugg::RemoveWholeUse { span: remove_spans[0] }
} else {
lints::UnusedImportsSugg::RemoveImports { remove_spans, num_to_remove }
};
let test_module_span =
test_module_span.map(|span| sess.source_map().guess_head_span(span));
lints::UnusedImports {
sugg,
test_module_span,
num_snippets: span_snippets.len(),
span_snippets: DiagArgValue::StrListSepByAnd(
span_snippets.into_iter().map(Cow::Owned).collect(),
),
}
.decorate_lint(diag);
}
BuiltinLintDiag::RedundantImport(spans, ident) => {
let subs = spans
.into_iter()
.map(|(span, is_imported)| {
(match (span.is_dummy(), is_imported) {
(false, true) => lints::RedundantImportSub::ImportedHere,
(false, false) => lints::RedundantImportSub::DefinedHere,
(true, true) => lints::RedundantImportSub::ImportedPrelude,
(true, false) => lints::RedundantImportSub::DefinedPrelude,
})(span)
})
.collect();
lints::RedundantImport { subs, ident }.decorate_lint(diag);
}
BuiltinLintDiag::DeprecatedMacro {
suggestion,
suggestion_span,
note,
path,
since_kind,
} => {
let sub = suggestion.map(|suggestion| stability::DeprecationSuggestion {
span: suggestion_span,
kind: "macro".to_owned(),
suggestion,
});
stability::Deprecated { sub, kind: "macro".to_owned(), path, note, since_kind }
.decorate_lint(diag);
}
BuiltinLintDiag::UnusedDocComment(attr_span) => {
lints::UnusedDocComment { span: attr_span }.decorate_lint(diag);
}
BuiltinLintDiag::PatternsInFnsWithoutBody { span: remove_span, ident, is_foreign } => {
let sub = lints::PatternsInFnsWithoutBodySub { ident, span: remove_span };
if is_foreign {
lints::PatternsInFnsWithoutBody::Foreign { sub }
} else {
lints::PatternsInFnsWithoutBody::Bodiless { sub }
}
.decorate_lint(diag);
}
BuiltinLintDiag::MissingAbi(label_span, default_abi) => {
lints::MissingAbi { span: label_span, default_abi: default_abi.name() }
.decorate_lint(diag);
}
BuiltinLintDiag::LegacyDeriveHelpers(label_span) => {
lints::LegacyDeriveHelpers { span: label_span }.decorate_lint(diag);
}
BuiltinLintDiag::OrPatternsBackCompat(suggestion_span, suggestion) => {
lints::OrPatternsBackCompat { span: suggestion_span, suggestion }.decorate_lint(diag);
}
BuiltinLintDiag::ReservedPrefix(label_span, prefix) => {
lints::ReservedPrefix {
label: label_span,
suggestion: label_span.shrink_to_hi(),
prefix,
}
.decorate_lint(diag);
}
BuiltinLintDiag::RawPrefix(label_span) => {
lints::RawPrefix { label: label_span, suggestion: label_span.shrink_to_hi() }
.decorate_lint(diag);
}
BuiltinLintDiag::ReservedString(suggestion) => {
lints::ReservedString { suggestion }.decorate_lint(diag);
}
BuiltinLintDiag::UnusedBuiltinAttribute { attr_name, macro_name, invoc_span } => {
lints::UnusedBuiltinAttribute { invoc_span, attr_name, macro_name }.decorate_lint(diag);
}
BuiltinLintDiag::TrailingMacro(is_trailing, name) => {
lints::TrailingMacro { is_trailing, name }.decorate_lint(diag);
}
BuiltinLintDiag::BreakWithLabelAndLoop(sugg_span) => {
lints::BreakWithLabelAndLoop {
sub: lints::BreakWithLabelAndLoopSub {
left: sugg_span.shrink_to_lo(),
right: sugg_span.shrink_to_hi(),
},
}
.decorate_lint(diag);
}
BuiltinLintDiag::UnexpectedCfgName(name, value) => {
check_cfg::unexpected_cfg_name(sess, name, value).decorate_lint(diag);
}
BuiltinLintDiag::UnexpectedCfgValue(name, value) => {
check_cfg::unexpected_cfg_value(sess, name, value).decorate_lint(diag);
}
BuiltinLintDiag::DeprecatedWhereclauseLocation(left_sp, sugg) => {
let suggestion = match sugg {
Some((right_sp, sugg)) => lints::DeprecatedWhereClauseLocationSugg::MoveToEnd {
left: left_sp,
right: right_sp,
sugg,
},
None => lints::DeprecatedWhereClauseLocationSugg::RemoveWhere { span: left_sp },
};
lints::DeprecatedWhereClauseLocation { suggestion }.decorate_lint(diag);
}
BuiltinLintDiag::MissingUnsafeOnExtern { suggestion } => {
lints::MissingUnsafeOnExtern { suggestion }.decorate_lint(diag);
}
BuiltinLintDiag::SingleUseLifetime {
param_span,
use_span: Some((use_span, elide)),
deletion_span,
ident,
} => {
debug!(?param_span, ?use_span, ?deletion_span);
let suggestion = if let Some(deletion_span) = deletion_span {
let (use_span, replace_lt) = if elide {
let use_span = sess.source_map().span_extend_while_whitespace(use_span);
(use_span, String::new())
} else {
(use_span, "'_".to_owned())
};
debug!(?deletion_span, ?use_span);
let deletion_span =
if deletion_span.is_empty() { None } else { Some(deletion_span) };
Some(lints::SingleUseLifetimeSugg { deletion_span, use_span, replace_lt })
} else {
None
};
lints::SingleUseLifetime { suggestion, param_span, use_span, ident }
.decorate_lint(diag);
}
BuiltinLintDiag::SingleUseLifetime { use_span: None, deletion_span, ident, .. } => {
debug!(?deletion_span);
lints::UnusedLifetime { deletion_span, ident }.decorate_lint(diag);
}
BuiltinLintDiag::NamedArgumentUsedPositionally {
position_sp_to_replace,
position_sp_for_msg,
named_arg_sp,
named_arg_name,
is_formatting_arg,
} => {
let (suggestion, name) = if let Some(positional_arg_to_replace) = position_sp_to_replace
{
let mut name = named_arg_name.clone();
if is_formatting_arg {
name.push('$')
};
let span_to_replace = if let Ok(positional_arg_content) =
sess.source_map().span_to_snippet(positional_arg_to_replace)
&& positional_arg_content.starts_with(':')
{
positional_arg_to_replace.shrink_to_lo()
} else {
positional_arg_to_replace
};
(Some(span_to_replace), name)
} else {
(None, String::new())
};
lints::NamedArgumentUsedPositionally {
named_arg_sp,
position_label_sp: position_sp_for_msg,
suggestion,
name,
named_arg_name,
}
.decorate_lint(diag);
}
BuiltinLintDiag::ByteSliceInPackedStructWithDerive { ty } => {
lints::ByteSliceInPackedStructWithDerive { ty }.decorate_lint(diag);
}
BuiltinLintDiag::UnusedExternCrate { removal_span } => {
lints::UnusedExternCrate { removal_span }.decorate_lint(diag);
}
BuiltinLintDiag::ExternCrateNotIdiomatic { vis_span, ident_span } => {
let suggestion_span = vis_span.between(ident_span);
let code = if vis_span.is_empty() { "use " } else { " use " };
lints::ExternCrateNotIdiomatic { span: suggestion_span, code }.decorate_lint(diag);
}
BuiltinLintDiag::AmbiguousGlobImports { diag: ambiguity } => {
lints::AmbiguousGlobImports { ambiguity }.decorate_lint(diag);
}
BuiltinLintDiag::AmbiguousGlobReexports {
name,
namespace,
first_reexport_span,
duplicate_reexport_span,
} => {
lints::AmbiguousGlobReexports {
first_reexport: first_reexport_span,
duplicate_reexport: duplicate_reexport_span,
name,
namespace,
}
.decorate_lint(diag);
}
BuiltinLintDiag::HiddenGlobReexports {
name,
namespace,
glob_reexport_span,
private_item_span,
} => {
lints::HiddenGlobReexports {
glob_reexport: glob_reexport_span,
private_item: private_item_span,
name,
namespace,
}
.decorate_lint(diag);
}
BuiltinLintDiag::UnusedQualifications { removal_span } => {
lints::UnusedQualifications { removal_span }.decorate_lint(diag);
}
BuiltinLintDiag::UnsafeAttrOutsideUnsafe {
attribute_name_span,
sugg_spans: (left, right),
} => {
lints::UnsafeAttrOutsideUnsafe {
span: attribute_name_span,
suggestion: lints::UnsafeAttrOutsideUnsafeSuggestion { left, right },
}
.decorate_lint(diag);
}
BuiltinLintDiag::AssociatedConstElidedLifetime {
elided,
span: lt_span,
lifetimes_in_scope,
} => {
let lt_span = if elided { lt_span.shrink_to_hi() } else { lt_span };
let code = if elided { "'static " } else { "'static" };
lints::AssociatedConstElidedLifetime {
span: lt_span,
code,
elided,
lifetimes_in_scope,
}
.decorate_lint(diag);
}
BuiltinLintDiag::RedundantImportVisibility { max_vis, span: vis_span, import_vis } => {
lints::RedundantImportVisibility { span: vis_span, help: (), max_vis, import_vis }
.decorate_lint(diag);
}
BuiltinLintDiag::UnknownDiagnosticAttribute { span: typo_span, typo_name } => {
let typo = typo_name.map(|typo_name| lints::UnknownDiagnosticAttributeTypoSugg {
span: typo_span,
typo_name,
});
lints::UnknownDiagnosticAttribute { typo }.decorate_lint(diag);
}
BuiltinLintDiag::MacroUseDeprecated => {
lints::MacroUseDeprecated.decorate_lint(diag);
}
BuiltinLintDiag::UnusedMacroUse => lints::UnusedMacroUse.decorate_lint(diag),
BuiltinLintDiag::PrivateExternCrateReexport { source: ident, extern_crate_span } => {
lints::PrivateExternCrateReexport { ident, sugg: extern_crate_span.shrink_to_lo() }
.decorate_lint(diag);
}
BuiltinLintDiag::UnusedLabel => lints::UnusedLabel.decorate_lint(diag),
BuiltinLintDiag::MacroIsPrivate(ident) => {
lints::MacroIsPrivate { ident }.decorate_lint(diag);
}
BuiltinLintDiag::UnusedMacroDefinition(name) => {
lints::UnusedMacroDefinition { name }.decorate_lint(diag);
}
BuiltinLintDiag::MacroRuleNeverUsed(n, name) => {
lints::MacroRuleNeverUsed { n: n + 1, name }.decorate_lint(diag);
}
BuiltinLintDiag::UnstableFeature(msg) => {
lints::UnstableFeature { msg }.decorate_lint(diag);
}
BuiltinLintDiag::AvoidUsingIntelSyntax => {
lints::AvoidIntelSyntax.decorate_lint(diag);
}
BuiltinLintDiag::AvoidUsingAttSyntax => {
lints::AvoidAttSyntax.decorate_lint(diag);
}
BuiltinLintDiag::IncompleteInclude => {
lints::IncompleteInclude.decorate_lint(diag);
}
BuiltinLintDiag::UnnameableTestItems => {
lints::UnnameableTestItems.decorate_lint(diag);
}
BuiltinLintDiag::DuplicateMacroAttribute => {
lints::DuplicateMacroAttribute.decorate_lint(diag);
}
BuiltinLintDiag::CfgAttrNoAttributes => {
lints::CfgAttrNoAttributes.decorate_lint(diag);
}
BuiltinLintDiag::MissingFragmentSpecifier => {
lints::MissingFragmentSpecifier.decorate_lint(diag);
}
BuiltinLintDiag::MetaVariableStillRepeating(name) => {
lints::MetaVariableStillRepeating { name }.decorate_lint(diag);
}
BuiltinLintDiag::MetaVariableWrongOperator => {
lints::MetaVariableWrongOperator.decorate_lint(diag);
}
BuiltinLintDiag::DuplicateMatcherBinding => {
lints::DuplicateMatcherBinding.decorate_lint(diag);
}
BuiltinLintDiag::UnknownMacroVariable(name) => {
lints::UnknownMacroVariable { name }.decorate_lint(diag);
}
BuiltinLintDiag::UnusedCrateDependency { extern_crate, local_crate } => {
lints::UnusedCrateDependency { extern_crate, local_crate }.decorate_lint(diag)
}
BuiltinLintDiag::WasmCAbi => lints::WasmCAbi.decorate_lint(diag),
BuiltinLintDiag::IllFormedAttributeInput { suggestions } => {
lints::IllFormedAttributeInput {
num_suggestions: suggestions.len(),
suggestions: DiagArgValue::StrListSepByAnd(
suggestions.into_iter().map(|s| format!("`{s}`").into()).collect(),
),
}
.decorate_lint(diag)
}
BuiltinLintDiag::InnerAttributeUnstable { is_macro } => if is_macro {
lints::InnerAttributeUnstable::InnerMacroAttribute
} else {
lints::InnerAttributeUnstable::CustomInnerAttribute
}
.decorate_lint(diag),
BuiltinLintDiag::OutOfScopeMacroCalls { path } => {
lints::OutOfScopeMacroCalls { path }.decorate_lint(diag)
}
BuiltinLintDiag::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by } => {
lints::UnexpectedBuiltinCfg { cfg, cfg_name, controlled_by }.decorate_lint(diag)
}
BuiltinLintDiag::ElidedNamedLifetimes { elided: (span, kind), resolution } => {
match resolution {
ElidedLifetimeResolution::Static => {
ElidedNamedLifetime { span, kind, name: kw::StaticLifetime, declaration: None }
}
ElidedLifetimeResolution::Param(name, declaration) => {
ElidedNamedLifetime { span, kind, name, declaration: Some(declaration) }
}
}
.decorate_lint(diag)
}
}
}